664884864426 has 64 divisors (see below), whose sum is σ = 1436782157568. Its totient is φ = 204338254848.

The previous prime is 664884864403. The next prime is 664884864461. The reversal of 664884864426 is 624468488466.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3402636 + ... + 3592728.

It is an arithmetic number, because the mean of its divisors is an integer number (22449721212).

Almost surely, 2^664884864426 is an apocalyptic number.

664884864426 is an abundant number, since it is smaller than the sum of its proper divisors (771897293142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664884864426 is a wasteful number, since it uses less digits than its factorization.

664884864426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190815.

The product of its digits is 339738624, while the sum is 66.

The spelling of 664884864426 in words is "six hundred sixty-four billion, eight hundred eighty-four million, eight hundred sixty-four thousand, four hundred twenty-six".